Add more const-ness to the stream endpoint/pipe functions where possible.

[pub/USBasp.git] / LUFA / Drivers / Peripheral / SPI.h

diff --git a/LUFA/Drivers/Peripheral/SPI.h b/LUFA/Drivers/Peripheral/SPI.h
index 9e64753..0b8b17e 100644 (file)
--- a/LUFA/Drivers/Peripheral/SPI.h
+++ b/LUFA/Drivers/Peripheral/SPI.h
@@ -1,21 +1,21 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2010.
-              
+     Copyright (C) Dean Camera, 2011.
+

   dean [at] fourwalledcubicle [dot] com
   dean [at] fourwalledcubicle [dot] com

-      www.fourwalledcubicle.com
+           www.lufa-lib.org

 */
 
 /*
 */
 
 /*

-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)

 
 

-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this

   software and its documentation for any purpose is hereby granted
   software and its documentation for any purpose is hereby granted

-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in

   all copies and that both that the copyright notice and this
   all copies and that both that the copyright notice and this

-  permission notice and warranty disclaimer appear in supporting 
-  documentation, and that the name of the author not be used in 
-  advertising or publicity pertaining to distribution of the 
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the

   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this
   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this


@@ -41,10 +41,33 @@
  *  The following files must be built with any user project that uses this module:
  *    - None
  *
  *  The following files must be built with any user project that uses this module:
  *    - None
  *

- *  \section Module Description
+ *  \section Sec_ModDescription Module Description

  *  Driver for the hardware SPI port available on most AVR models. This module provides
  *  an easy to use driver for the setup of and transfer of data over the AVR's SPI port.
  *
  *  Driver for the hardware SPI port available on most AVR models. This module provides
  *  an easy to use driver for the setup of and transfer of data over the AVR's SPI port.
  *

+ *  \section Sec_ExampleUsage Example Usage
+ *  The following snippet is an example of how this module may be used within a typical
+ *  application.
+ *
+ *  \code
+ *      // Initialise the SPI driver before first use
+ *      SPI_Init(SPI_SPEED_FCPU_DIV_2 | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_FALLING |
+ *               SPI_SAMPLE_TRAILING | SPI_MODE_MASTER);
+ *
+ *      // Send several bytes, ignoring the returned data
+ *      SPI_SendByte(0x01);
+ *      SPI_SendByte(0x02);
+ *      SPI_SendByte(0x03);
+ *
+ *      // Receive several bytes, sending a dummy 0x00 byte each time
+ *      uint8_t Byte1 = SPI_ReceiveByte();
+ *      uint8_t Byte2 = SPI_ReceiveByte();
+ *      uint8_t Byte3 = SPI_ReceiveByte();
+ *
+ *      // Send a byte, and store the received byte from the same transaction
+ *      uint8_t ResponseByte = SPI_TransferByte(0xDC);
+ *  \endcode
+ * 

  *  @{
  */
 
  *  @{
  */
 


@@ -64,83 +87,105 @@
                /* Macros: */
                        #define SPI_USE_DOUBLESPEED            (1 << SPE)
        #endif
                /* Macros: */
                        #define SPI_USE_DOUBLESPEED            (1 << SPE)
        #endif

-       
+

        /* Public Interface - May be used in end-application: */
                /* Macros: */
        /* Public Interface - May be used in end-application: */
                /* Macros: */

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 2. */
+                       /** \name SPI Prescaler Configuration Masks */
+                       //@{
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 2. */

                        #define SPI_SPEED_FCPU_DIV_2           SPI_USE_DOUBLESPEED
 
                        #define SPI_SPEED_FCPU_DIV_2           SPI_USE_DOUBLESPEED
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 4. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 4. */

                        #define SPI_SPEED_FCPU_DIV_4           0
 
                        #define SPI_SPEED_FCPU_DIV_4           0
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 8. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 8. */

                        #define SPI_SPEED_FCPU_DIV_8           (SPI_USE_DOUBLESPEED | (1 << SPR0))
 
                        #define SPI_SPEED_FCPU_DIV_8           (SPI_USE_DOUBLESPEED | (1 << SPR0))
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 16. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 16. */

                        #define SPI_SPEED_FCPU_DIV_16          (1 << SPR0)
 
                        #define SPI_SPEED_FCPU_DIV_16          (1 << SPR0)
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 32. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 32. */

                        #define SPI_SPEED_FCPU_DIV_32          (SPI_USE_DOUBLESPEED | (1 << SPR1))
 
                        #define SPI_SPEED_FCPU_DIV_32          (SPI_USE_DOUBLESPEED | (1 << SPR1))
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 64. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 64. */

                        #define SPI_SPEED_FCPU_DIV_64          (SPI_USE_DOUBLESPEED | (1 << SPR1) | (1 << SPR0))
 
                        #define SPI_SPEED_FCPU_DIV_64          (SPI_USE_DOUBLESPEED | (1 << SPR1) | (1 << SPR0))
 

-                       /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 128. */
+                       /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 128. */

                        #define SPI_SPEED_FCPU_DIV_128         ((1 << SPR1) | (1 << SPR0))
                        #define SPI_SPEED_FCPU_DIV_128         ((1 << SPR1) | (1 << SPR0))

-                       
-                       /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the rising edge. */
+                       //@}
+
+                       /** \name SPI SCK Polarity Configuration Masks */
+                       //@{
+                       /** SPI clock polarity mask for \c SPI_Init(). Indicates that the SCK should lead on the rising edge. */

                        #define SPI_SCK_LEAD_RISING            (0 << CPOL)
 
                        #define SPI_SCK_LEAD_RISING            (0 << CPOL)
 

-                       /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the falling edge. */
+                       /** SPI clock polarity mask for \c SPI_Init(). Indicates that the SCK should lead on the falling edge. */

                        #define SPI_SCK_LEAD_FALLING           (1 << CPOL)
                        #define SPI_SCK_LEAD_FALLING           (1 << CPOL)

+                       //@}

 
 

-                       /** SPI data sample mode mask for SPI_Init(). Indicates that the data should sampled on the leading edge. */
+                       /** \name SPI Sample Edge Configuration Masks */
+                       //@{
+                       /** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should sampled on the leading edge. */

                        #define SPI_SAMPLE_LEADING             (0 << CPHA)
 
                        #define SPI_SAMPLE_LEADING             (0 << CPHA)
 

-                       /** SPI data sample mode mask for SPI_Init(). Indicates that the data should be sampled on the trailing edge. */
+                       /** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should be sampled on the trailing edge. */

                        #define SPI_SAMPLE_TRAILING            (1 << CPHA)
                        #define SPI_SAMPLE_TRAILING            (1 << CPHA)

+                       //@}

                        
                        

-                       /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
+                       /** \name SPI Data Ordering Configuration Masks */
+                       //@{
+                       /** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */
+                       #define SPI_ORDER_MSB_FIRST            (0 << DORD)
+
+                       /** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */
+                       #define SPI_ORDER_LSB_FIRST            (1 << DORD)
+                       //@}
+                       
+                       /** \name SPI Mode Configuration Masks */
+                       //@{
+                       /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */

                        #define SPI_MODE_SLAVE                 (0 << MSTR)
 
                        #define SPI_MODE_SLAVE                 (0 << MSTR)
 

-                       /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
+                       /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */

                        #define SPI_MODE_MASTER                (1 << MSTR)
                        #define SPI_MODE_MASTER                (1 << MSTR)

-
+                       //@}
+                       

                /* Inline Functions: */
                /* Inline Functions: */

-                       /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other
+                       /** Initialises the SPI subsystem, ready for transfers. Must be called before calling any other

                         *  SPI routines.
                         *
                         *  SPI routines.
                         *

-                        *  \param[in] SPIOptions  SPI Options, a mask consisting of one of each of the SPI_SPEED_*,
-                        *                         SPI_SCK_*, SPI_SAMPLE_* and SPI_MODE_* masks
+                        *  \param[in] SPIOptions  SPI Options, a mask consisting of one of each of the \c SPI_SPEED_*,
+                        *                         \c SPI_SCK_*, \c SPI_SAMPLE_*, \c SPI_ORDER_* and \c SPI_MODE_* masks.

                         */
                        static inline void SPI_Init(const uint8_t SPIOptions)
                        {
                         */
                        static inline void SPI_Init(const uint8_t SPIOptions)
                        {

-                               DDRB  |= ((1 << 1) | (1 << 2));
-                               PORTB |= ((1 << 0) | (1 << 3));
-                               
+                               DDRB  |=  ((1 << 1) | (1 << 2));
+                               DDRB  &= ~((1 << 0) | (1 << 3));
+                               PORTB |=  ((1 << 0) | (1 << 3));
+

                                SPCR   = ((1 << SPE) | SPIOptions);
                                SPCR   = ((1 << SPE) | SPIOptions);

-                               
+

                                if (SPIOptions & SPI_USE_DOUBLESPEED)
                                  SPSR |= (1 << SPI2X);
                                else
                                  SPSR &= ~(1 << SPI2X);
                        }
                                if (SPIOptions & SPI_USE_DOUBLESPEED)
                                  SPSR |= (1 << SPI2X);
                                else
                                  SPSR &= ~(1 << SPI2X);
                        }

-                       
+

                        /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */
                        /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */

-                       static inline void SPI_ShutDown(void)
+                       static inline void SPI_Disable(void)

                        {
                                DDRB  &= ~((1 << 1) | (1 << 2));
                                PORTB &= ~((1 << 0) | (1 << 3));
                        {
                                DDRB  &= ~((1 << 1) | (1 << 2));
                                PORTB &= ~((1 << 0) | (1 << 3));

-                               
+

                                SPCR   = 0;
                                SPSR   = 0;
                        }
                                SPCR   = 0;
                                SPSR   = 0;
                        }

-                       
+

                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
                         *
                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
                         *

-                        *  \param[in] Byte  Byte to send through the SPI interface
+                        *  \param[in] Byte  Byte to send through the SPI interface.

                         *
                         *

-                        *  \return Response byte from the attached SPI device
+                        *  \return Response byte from the attached SPI device.

                         */
                        static inline uint8_t SPI_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
                        static inline uint8_t SPI_TransferByte(const uint8_t Byte)
                         */
                        static inline uint8_t SPI_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
                        static inline uint8_t SPI_TransferByte(const uint8_t Byte)


@@ -153,7 +198,7 @@
                        /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response
                         *  byte sent to from the attached SPI device is ignored.
                         *
                        /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response
                         *  byte sent to from the attached SPI device is ignored.
                         *

-                        *  \param[in] Byte Byte to send through the SPI interface
+                        *  \param[in] Byte  Byte to send through the SPI interface.

                         */
                        static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
                        static inline void SPI_SendByte(const uint8_t Byte)
                         */
                        static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
                        static inline void SPI_SendByte(const uint8_t Byte)


@@ -165,7 +210,7 @@
                        /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response
                         *  byte from the attached SPI device is returned.
                         *
                        /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response
                         *  byte from the attached SPI device is returned.
                         *

-                        *  \return The response byte from the attached SPI device
+                        *  \return The response byte from the attached SPI device.

                         */
                        static inline uint8_t SPI_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
                        static inline uint8_t SPI_ReceiveByte(void)
                         */
                        static inline uint8_t SPI_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
                        static inline uint8_t SPI_ReceiveByte(void)


@@ -179,7 +224,8 @@
                #if defined(__cplusplus)
                        }
                #endif
                #if defined(__cplusplus)
                        }
                #endif

-               
+

 #endif
 
 /** @} */
 #endif
 
 /** @} */

+